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According to Newton's first law of motion, a body will continue in its state of uniform motion along a straight line when there is no net force acting on it. That means if the roller coaster is under no external forces, it would move in a straight line tangential to the track. However, there should be forces acting on it because its direction of motion changes. Assuming that the mass of the roller coaster is

, it is moving at a velocity

, and the track is circular with a radius

, the centripetal force required would be

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12y ago

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